3 digits display for days ('ddd') does not function...

[jadeye]

I read everything I could find here (inc. "How do I display 3 digits for days ('ddd')? #33" ) but still I only get 2 digits for days. Here's my code:

jQuery(document).ready(function($) {
    $('#counter').countdown({ 
        image: "wp-content/themes/sometheme/img/digits.png", 
        format: "ddd:hh:mm:ss", 
        endTime: new Date('12/29/16 23:59:59') 
    });
});